How durable they are depends on what you use them for. As many other people have said, they're not the best for bath bomb molds and the like, but that's understandable considering they're not marketed as such. If you're just using them for decoration they'll hold up pretty well, but note the 40mm is only 1.5" in diameter so not much can be put in, the 60mm is about 2.3". in diameter, so they are more suitable for placing small figures, sweets or even hanging a small picture. I personally used them on a project where I sanded them lightly on the outside with 400 grit sandpaper so my spray paint would stick to them without slipping. All my 40mm held up well, none of them broke, but one of my 60mm broke in half when I was fiddling with it, most likely because I loosened it a bit by cutting/grinding a small latch. at the top used to attach a rope for hanging. All in all a very good price and it holds up well for normal use, how well it holds up for other uses varies.
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